Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -37,11 +37,11 @@
 		tcl_nano_debug='true'
 	fi
 ])
 if test "$tcl_nano_debug" = 'true'; then
 	AC_DEFINE(TCLEXT_TCL_NANO_DEBUG, [1], [Enable debugging build])
-	AX_CHECK_COMPILE_FLAG([-fcheck-pointer-bounds], [CFLAGS="$CFLAGS -fcheck-pointer-bounds"])
+	AX_CHECK_COMPILE_FLAG([-mmpx -fcheck-pointer-bounds], [CFLAGS="$CFLAGS -mmpx -fcheck-pointer-bounds"])
 	AX_CHECK_COMPILE_FLAG([-g3], [CFLAGS="$CFLAGS -g3"])
 	AX_CHECK_COMPILE_FLAG([-ggdb3], [CFLAGS="$CFLAGS -ggdb3"])
 else
 	dnl If we are not doing debugging disable some of the more annoying warnings
 	AX_CHECK_COMPILE_FLAG([-Wno-unused-value], [CFLAGS="$CFLAGS -Wno-unused-value"])